Electric heater.



E. N. LIGHTFOOT.

ELECTRIC HEATER.

APPLICATION FILED NOV. I8. 191|.

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Patented June 29, 1915.

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T0 all whom it may concern Be it known that I, EDWIN N. LIGHTroo'i,acitizen of the'United States, residing, at .N ew York, in the countyofNeW York and State .of vNew Yorlnhave invented new and usefulImprovements in Electric Heaters, of which the following is a full,clear, concise, and exact description, reference being had to theaccompanying drawing, forming a part of this specification.

This invention relates to electric heaters One of the objects of theinvention is to provide an' improved electric heater in which thecircuit connections of the heating coils are changed by insertion of anobject to be heated into the heater.

Another objectis to vprovide an improved means for controlling thecircuit connections offthe lheating coils byi the insertion of an-object-to be heatedfiiito lthe heater.

Other objects andv advantages of the invent-ion will hereinafter appear.

The accompanying drawings illustrate an embodiment of the invention.

In the views of these drawings :#Figure 1 shows a 'partial longitudinalsectional View of a heater. Fig. 2 shows a'sectional view on line 2-2of' Fig. l. Fig. 3 shows an end elevation of the heater. Fig. 4.- showsa diagram of one form of circuit connections.

In the construction shown, I have illus trated aheater of the type knownas a combined curling r iron and greasepaint heater.

,i described in an application of Harry W.

Denhard, Serial No. 651,813, filed Oct. 31, 1911.l hAs in theconstruction shown in that application, I preferably provide a heatingcoil 1 which is Wound about a central sleeve 2 and insulated therefromby a suitable. sheet of insulation 3, the sleeve and coil be.

ing carried in a substantially closed chamber between the end members 4of a suitable frame, preferably provided with a bottom The frame 4 ispreferably carried coil l a second heating coil or unit 7 is pre erablyprovided, being suitablycarried between ythe end members 4, and abovethis coil `or unit 7 suitable grease pans 8 are preferably A thisportion of the heater, however,1 forms no part` of my invention and 1sthe invention of Harry W. Denhard and described in his applicationheretofore referred to. Various other forms of construction may be usedif' desired.

mounted. The construction ,of

Specication of Letters Patent. 1 Pantani-,ed June 29, @9115,

Application filed November 18, 1911. Serial No. 661,161.

In a preferred forni, I provide a, door 9` the door with an extension l2having-lugs or other projections 13 on its end which extendsubstantially at right angles on appz site sides of the body of theextension (see Fig. 3). In a preferred form, the extension 12 is locatednear one of the ends of the pivot pin 10 as shown in Fig. 3. Theprojections or lugs 13 preferably carr a suit able sheet of insulation14 and on t e oppon site side of said sheet of insulation are preferablyprovided with a conducting strip"vv 15 ugs which extends across thebottom of the 13 as shown in Fig. 3. These conducting strips may be`attached to the studs 13 by any suitable :means as,- for instance, by

screws 16', and these screws are preferably suitably insulated from thestuds.

Upon the bottom plate 5 is preferably seated a plurality of resilientconducting strips 17 and 18 which are attached to the bottom plate bymeans of suitable screws, bolts or other devices 19 and 20: Bypreference, these resilient members are bent slightly upwardintermediatetheir ends as shown in Fig. 1, their free ends normally extending inalane substantially parallel with the planeo' the bottom plate 5. Wheiilan 'object to be heated is inserted inV the sleeve 2, the door 9 .'sthrown back about its pivot l0 y until the conducting strip 15 bridgesthe two resilient contacts 1,7 and 18.

Conversely when the article to be heated is removed from the heatingchamber, the door Sisthrown forward about its pivot by the resilientaction of the contacts and returned` to its normal position closing'theopening to the lieatin chamber. If desired, I may fprovide an a ditionalcoiled spring 21 for kreturning the door which has one end attached tothe extension 12 and the other fixed to the frame.

In Fig. 4 I have illustrated diagrammatically one form of circuitconnections which I preferably employ. These circuit connections may becontrolled by a. Switch mechanism of the type just described. 0bviously,however, various other forms of switch mechanism may be employed toproduce the results which I obtain by my improved arrangement of circuitconnections. As shown in Fig. 4, the heating coils l and 7 `are arrangedin series with the line when the movable contact member 15 is in opensistance coil 7 develops a greater percentage y of heat than thecoil land `consequently the greasev paint heater is operative with the coilsyin series.` Ordinarily the current which ioW's When'the coils are inseries is not sutlicient to cause the coil 1 to generate enough heat toheat a curling iron. To -meet this condition, I provide a shuntincluding a conductor 23 around the grease paint heater and locate theswitch mechanism in this 'shunt so that it will make and break the same.Thus when the curling iron is inserted in the .heating chamber, theshunt around the4 grease paint heater or coil 7 is y jcloscd and thiscoil is short circuited, permit/ting a greater amount of current to iiowthrough the coil 1 of the curling iron heater to provide therequisiteamount of heat.

By my'iniproved circuit connectionsand my improved construction, I lhaveprovided an electric heating device wherein the heat is distributedinthe required proportion tol the object to bel heated. By shortcircuiting the grease paint coil, I am able to lconcentrate the heatin'v the curling iron coil and thus more quickly bring the curling ironto the desired temperature. At the same time that the curling iron coilis supplied with the maximum current, the heat developed by this-coil isradiated upward to thegrease paint heater which is located. above thesame so that the grease. .paint pan is kept at the' proper temperature.When'itvis .desired to remove the curling iron, the original circuitconnections are restored and the grease pain heater ism-again thrown in`seriesvith the f curling iron heater, the etfect being to cut ldown theamount of energy absorbed-by the curling' ironf'coil and supply energyto, the grease .paint coil. It at any timeitis de-y siredto throw bothof the coils out fof circuit all that it .is necessary to Ado is toopenthe line switch. lBy my improved arrangement of circuit connections, Iam able to increase the ellicicncv ot the heatinf.r coils and todistributctlie heat more neariy in v.the proportion i'equirgd. Further,by my 1mproved construction of switch mechanism, I

specific form shown for purposes of illustration, but Wish rather toinclude Within the scope of this application all of those forms of myinvention which fall Within. its spirit.

What I claim as new and desire to secure by Letters Patent is In anelectric heating device, a plu- Arality of heating coils/f normallysimultaneously in circuit and means actuated by the placement. of theobject to be heated Within the heating zone for short circuiting l onelof said coils.

2. In an electric heating device, av plurality of heating coils ofdifferent resistance` norm..lly simultaneously in circuit, and meansyactuated by the `placementof the object to lbe heated within theheating zone forV short circuiting certain Yof said coils.

3. In an electric lheating device, a plurality of heating coilsofditferent resistance simultaneously incireuit, and means actuated byan object to be heated for short circuiting certain of said, coilshaving a higher resistance.

4. In an electric heating device, a plurality of coils simultaneously incircuit, one

of said coils `b 'ng arranged to form a chamber, a door for saidchamber, and means for` short circutting one of said coils upon move-`ment of said door.

v5. In an' electric heating device, a plu rality of heating coils inseries, one of said coils being arranged to form a chamber, a door forsaid chamber, and means actuated by 1said door for shortcircuiting oneof said co1 s.

6. In an electric heating device, a pluralityof heating coils of dilferent resistance in series, one of said coils'being arranged to form achamber, a door for said chamber,

and meanscontrolledby movement ofsaid door for short circuiting the coilof higher resistance.

7. In an electric heating device, a pluralityof heating coilsofdifferent resistance yarranged inseries, one of said coils forming achamber, a door for said chamber, `and a plurality of resilient contactsbridged upon movement of said door to short circuit one of said coils. yl l.

8. Inan electric heating device, a plurality ofheating coils ofdifferent resistance ladaptedto be simultaneously in circuit, one

of said coils being arranged to form a chamd ber, a door for saidchamber, and means controlled by movement of said door for shortcirouiting the coil of higher resistance, said means serving to holdsaid door normally closed.

- 9. vIn an electric heating device, a plurality of heating coils ofdiierent resistance arranged in series, one of said coils being arrangedto receive an object to be heated, a plurality of objects heatedthereby, a frame in which said coils are carried, and means chamberadapted to receive an object to be heated, a movable element mountedadjacent the open end of the chamber and normallyT biased to obstructthe entrance of the object to be heated, means carried by said ele-`ment for closing` a circuit, `said element being adapted to be moved theobject as it is inserted whereby the circuit` is closed by chamber.

' l1'. An electric heater having a heating "chamber adapted to receivean object to be Correctonsn 'Letters PatentA No. 1,144,981.

[slaan] heated, a door pivoted adjacent one end of said chamber normallybiased to obstruct the entrance of an object to be heat/ed, meanscarried by said door for completing an electric circuit, said door beingadapted to be moved by the object as it is inserted whereby the circuitis closed by the insertion of the object into the heating chamber.

12. An electric heater having a heating chamber adapted to receive anobject to be heated, a plurality of contacts mounted yadjacent one endof said chamber, a door pivoted adjacent the same end of the chamber',conducting means carried by said door adapted to engage said contacts, aspring for biasing said door to normally obstruct the entrance of anobject' into the heating chamber, said door being adapted toV be movedby the object as it is inserted whereby the conducting means coperateswith the contacts to complete an electric circuit by insertion oftheobject into ,the heating chamber.

In Witness whereof, I have hereunto sub-` scribed my name i'n thepresence of two Wit- EDWIN N. LIGHTFOT.

Witnesses: lV. D. HADAWAY, Gaonon J. MALLoN.

'nesses the insertion of the object into the heatingl It is herebycertified that in Letters Patent No. 1,144,981, granted June 2.9, '1915,.i 4upon the application 'of EdWinN. Lightfoot, of New York, N. Y.,for-an improve- -ment in Electric Heaters,v errors appear in the'printed specification requiring correction as follows:A Page 1, line81, forthe Word-studsf read lugs; page -line 53, {irst column, fortheword pain read paint; and that the said Letters 'Patent ShQQld bevread with these corrections therein that'the same may conform to therecord of the case in the Patent Oiiice y Signed and sealed this 27thday of July, A. D., 1915.

a. r. WHITEHEAD,

Acting Commissioner of Patents.

